Intense nausea, vomiting, dilation of the pupils, increased heart rate, increased blood pressure, a rise in body temperature that causes heavy perspiration, headaches, muscle weakness, and impaired motor coordination

Side effects or risks of mescaline use may include:

• anxiety, fear
• racing heart beat (tachycardia)
• increased blood pressure
• dizziness
• weakness
• diarrhea
• elevated body temperature
• excessive sweating
• tremors
• intense nausea, vomiting
• headache
• accidental injury
• psychosis, panic or paranoia
• seizures
• amnesia (loss of memory)
• posthallucinogen perceptual disorder (flashbacks)
• rarely, suicidal thoughts or actions